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Date:   Wed, 20 Dec 2017 11:58:57 +0800
From:   Dou Liyang <>
To:     Thomas Gleixner <>,
        Alexandru Chirvasitu <>
CC:     Pavel Machek <>,
        kernel list <>,
        Ingo Molnar <>,
        "Maciej W. Rozycki" <>,
        Mikael Pettersson <>,
        Josh Poulson <>,
        Mihai Costache <>,
        Stephen Hemminger <>,
        Marc Zyngier <>,
        Haiyang Zhang <>,
        Dexuan Cui <>,
        Simon Xiao <>,
        Saeed Mahameed <>,
        Jork Loeser <>,
        Bjorn Helgaas <>,
        <>, KY Srinivasan <>
Subject: Re: PROBLEM: 4.15.0-rc3 APIC causes lockups on Core 2 Duo laptop

Hi Thomas,

At 12/20/2017 08:31 AM, Thomas Gleixner wrote:
> On Tue, 19 Dec 2017, Alexandru Chirvasitu wrote:
>> I had never heard of 'bisect' before this casual mention (you might tell
>> I am a bit out of my depth). I've since applied it to Linus' tree between
>> bebc608 Linux 4.14 (good)
>> and
>> 4fbd8d1 Linux 4.15-rc1 (bad)
> Is Linus current head 4.15-rc4 bad as well?
> Thanks for doing that bisect, but unfortunately this commit cannot be the
> problematic one, It merily adds a config symbol, but it does not change any
> code at all. It has no effect whatsoever. So something might have gone
> wrong in your bisecting.


> I CC'ed Dou Liyang. He has changed the early APIC setup code and there has
> been an issue reported already. Though I lost track of that. Dou, any
        ^^^^^^^^  Is it this one?
> pointers?

Not sure, but seems the APIC failed to start in that 32-bit system.

I will look into it.


Could you give me your .config file and the dmesg-log of 4.15.0-rc3.


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